Synthesis and Application of Modular Phosphine-Phosphoramidite Ligands in Asymmetric Hydroformylation: Structure-Selectivity Relationship
作者:Xiaowei Zhang、Bonan Cao、Yongjun Yan、Shichao Yu、Baoming Ji、Xumu Zhang
DOI:10.1002/chem.200902238
日期:2010.1.18
A series of hybrid phosphine–phosphoramidite ligands has been designed and synthesized in moderate yields from chiral BINOL (1,1′‐bi‐2‐naphthol) or NOBIN (2‐amino‐2′‐hydroxy‐1,1′‐binaphthyl). They have achieved highly regio‐ and enantioselectivities in Rh‐catalyzed asymmetric hydroformylations of styrene derivatives (branched/linear ratio up to 56.6, ee up to 99 %), vinyl acetate derivatives (up to
通过手性BINOL(1,1'-bi-2-萘酚)或NOBIN(2-amino-2'-hydroxy-1,1'-binaphthyl)设计并合成了一系列杂化膦-亚磷酰胺配体。他们在苯乙烯衍生物(支链/线性比高达56.6,ee高达99%),乙酸乙烯酯衍生物(高达ee高达98%)和烯丙基氰化物(高达RH)的Rh催化的不对称加氢甲酰化反应中获得了很高的区域和对映选择性。96%ee)。配体结构的系统变化表明,亚铁酰胺部分上的空间因子决定了配体的性能。随着障碍的增加,支链/线性比率上升,而ee苯乙烯的加氢甲酰化过程中的分子量值下降。但是,N取代基对选择性的影响不大。